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The script itself does not harm the users PC.
This is fundamentally different from the approach of many vendors in the web security space, and raises these questions: Do they know where the actual malware is? If yes, why are they blocking the innocent page that hosts the link? If not, why not, since they have found the link?
This section provides a high-level look at how WebFilter and WebPulse work. The next section will reveal technical details about WebPulse the black box. If the URL can be categorized locally, the category information can be used to allow or block the request. Typically, the percentage of locally unrated content is about five percent. In the cloud the URL will first be checked against the central master database.
This is comparable to the local lookup; if the URL is in the master database, the URL category will be sent back to the requesting WebPulse client and can be used to allow or block the request. The new result is automatically cached locally.
The URL category will be sent back to the requesting WebPulse client and can be used to allow or block the request. Some of the background processes are focused on providing new content ratings for the database. Others are focused on hunting for evidence of malware activity. DRTR is primarily a content categorizer, but it is also used to log a large amount of metadata about each URL it analyzes, and it is this metadata that feeds many of the background processes.
WebPulse uses several methods, including sandbox techniques, to analyze scripts and detect malicious payloads and referenced domains. When a user accesses a binary file through a URL that WebPulse has not seen before, WebPulse will also download that file and run it through a bank of up to ten different AV scanners with full heuristics, script analyzers for example, malicious java scripts with heap sprays , sandboxes, and other malware-detection mechanisms.
New threats are identified within ten minutes and automatically added to the master URL database to protect other customers. This is one way in which WebPulse cloud users work together to provide broad real-time protection and receive a strong zero-day response to new web threats when only a few anti-virus vendors have even been able to detect them.
In addition to Blue Coat s own analysis, several third-party URL feeds covering malware and phishing sites are reviewed for inclusion in the database. It s important to know that malware feeds are quality-checked before being integrated into the Blue Coat WebFilter database. This prevents false positives. For security-related categories, incremental BCWF database updates occur every five minutes.
This enables the local defense to maintain performance by responding to as many requests as possible. Recommended features for malware protection Blue Coat s web security solutions have a broad feature set. The following section provides a brief overview about features that are useful and recommended for malware protection. URL Filtering This is the first point at which requests to known malware sources can be blocked.
Unrated URLs are then analyzed in real time. If the desktop is infected with malware and is authenticated, it cannot communicate with systems on the Internet for example, to download additional malware or send out confidential information that are the malware sources. Without this authentication, the user is vulnerable to malware attacks.
Controlling data types If users have no right to install software on their desktops, why should they be able to download executable files from the Internet? Blocking executable files is another step in protecting against malware. Often malware tries to download software to add additional malicious content on the infected desktop.
Another reason for blocking executable files is that malicious dynamic links could point to an executable malware file that would be installed on the desktop. Blocking executable files prevents this threat. File-type blocking can be done based on true file-type detection.
Blue Coat best practice recommends blocking executable files in general for regular Internet users. If this is not acceptable, they should at least be blocked for sites that are unrated.
Blue Coat also maintains a Best Practices document, with additional recommendations for blocking content from certain categories. Because there are two connections one between client and proxy and one between proxy and server threats like buffer overflow attacks on the protocol level can be filtered out. The proxy changes protocol behavior from server to proxy to RFC-conforming behavior from proxy to client.
Terminating SSL at the proxy enables detection of malicious content and tunneled applications. Certificate management can be used to verify X.
Cloud security protects business where it lives
Non-SSL traffic attempting to exit via port which may be an indication of a malware infection can also be blocked by the proxy. Malware scanning The last step in malware protection is inline malware scanning. Inline AV scanning by dedicated ProxyAV appliances is a valuable differentiator from most other secure web gateway solutions, many of whom use a selective scanning approach. This means checking often enough to recognize normal traffic, so that new, unusual, or abnormal traffic can be spotted and investigated.
Blue Coat Reporter is a superb tool for analyzing access log files. False negatives provide another accuracy indicator. The question in this case would be, How many of type X did you miss? Blue Coat technology delivers the most accurate categorization of any web security vendor. Technically this is not percent correct.
URLs categorized as web hosting will also be sent to WebPulse for real-time analysis to apply a more accurate rating if necessary.
Multiple ratings per URL Web pages do not always fit easily into a single category. An example of this is which is both a social networking site and an application within Facebook.
An accurate web filter recognizes this and classifies the site into both of these categories, giving enterprises the flexibility to control which parts of any site can be accessed by their users.
WebFilter can provide up to four categories per web page, which reflects web page content much more accurately and makes possible thousands of granular sub-category combinations for flexible and powerful policy enforcement.
Customers do not want to block all image searches or all translation and archive requests. In contrast, Blue Coat is able to see the destination webpage embedded in the intermediary page to make an accurate and useful rating. For example, Blue Coat WebFilter accurately categorizes an archive of cnn. Note: On policy-enforcing systems like ProxySG or the Web Security Module, a search engine safe-search policy can be enforced which also helps to prevent users from bypassing the content filter policy.
Quality checks The WebPulse infrastructure is supported by a set of stringent quality checks designed to reduce false positives and over blocking. All rating changes and malware identifications must pass Blue Coat s proprietary quality checks before they are released to the customer base. Performance When talking about WebPulse, it s important to talk about performance.
WebFilter and WebPulse provide a highly scalable high-performance solution. Only a small percentage of the overall web traffic has to be analyzed by WebPulse in real time.
WebFilter is optimized to run on-proxy onbox. Rating requests are processed in RAM, usually an order of magnitude faster than when they are run offbox. WebFilter typically rates around 95 percent of the web pages requested by a corporate or educational user on-proxy in less than eight milliseconds.
For the other 5 percent, a rating can be instantly and transparently requested from WebPulse s master database typically in less than 70ms or from WebPulse s Dynamic Real Time Rating typically in about ms, although there are some dependencies on the performance of the site in question.
Processing rating requests on-proxy is the fastest possible architecture for high performance and scalability. That s why Blue Coat provides incremental database updates every five minutes for security-related categories and every six hours for non-securityrelated categories. Real-time rating supports about twenty languages, including Pornovian, a generic module that detects pornography-related content.
This and various threat-detection features, are key components of WebPulse.
Together they present another unique differentiator. Cybercriminals place a script on a trusted web page that forces the browser to download malicious content from a typically unrated and quickly changing malware host.
Real-time rating disassembles a web page and analyzes its components. At the same time, they also assess the source for indications of danger using more than nine years of WebFilter experience in mapping the shady parts of the Internet. If the combination of characteristics is sufficiently suspicious, they trigger.
The modules ask, how does the bad content differ from legitimate content? How are they serving their content? Where are they serving it from? Access to suspicious content, which triggers a response from the real-time malware detection modules, can be blocked immediately.
URL background checker The background checker system has two modules: a foreground real-time module and a background offline research module that checks the background of a URL or site.
Blue Coat WebPulse TM >
The research module gathers data on malware delivery networks MDN so the real-time module can ask, does this URL belong to one of those networks? Background analysis techniques Not all analysis can be done in real time. When there isn t enough information for a real-time decision, or when the content is not applicable to real-time rating, the boundary between real-time and background rating is being crossed.
For the small volume of content that cannot be rated in real time typically less than two percent a Deep Background Rating Analysis DBRA service uses sophisticated, proprietary techniques and feeds the analysis back into the master WebPulse ratings database. It s worth mention that DBRA processes also run on URLs that were rated in real time, to decide if a rating should be added to the database. This indicates that not all the URLs that have been rated in real time will be added to the database.
One criterion for adding a URL to the database is its number of requests per unit time. This model forces all traffic through the centralized data center for security and access controls—a complex configuration that results in a terrible user experience.
Cloud applications like Office were designed to be accessed directly through local internet breakouts. Zscaler cloud security enables local breakouts with full security controls. Digital transformation has changed the way people work The corporate network that once sat behind a security perimeter is now the internet, and the only way to provide comprehensive protection for users, no matter where they connect, is by moving security and access controls to the cloud.
The Zscaler cloud is always current with the latest security updates to keep you protected from rapidly evolving malware. And Zscaler minimizes costs and eliminates the complexity of patching, updating, and maintaining hardware and software.
Through a single interface, you can gain insight into every request — by user, location, and device around the world — in seconds. Ubiquitous The cloud is always reachable from anywhere, any time, from any device. Scalable You can add new features and thousands of users without breaking a sweat.
Integrated Security and other services talk to each other so you get full visibility.Often malware tries to download software to add additional malicious content on the infected desktop. Users should never be prevented from viewing a trusted web page.
Ongoing expansion plans: Blue Coat Security Labs continues to invest in people, equipment, and relationships to build and strengthen our internal expertise.
Inline AV scanning by dedicated ProxyAV appliances is a valuable differentiator from most other secure web gateway solutions, many of whom use a selective scanning approach. Blue Coat technology delivers the most accurate categorization of any web security vendor. Cloud applications like Office were designed to be accessed directly through local internet breakouts.
The next section will reveal technical details about WebPulse the black box. Malware behavioral scanners WebPulse utilizes several background behavioral scanners to run executable files within a sandbox to determine whether the behavior is in fact malicious.
WebPulse uses its cloud infrastructure to deliver web intelligence to Blue Coat Web Security solutions, both appliance and cloud-based. In many cases, web-based attacks start by injecting scripts into trusted web pages.
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